[soraia]

I take a slightly different view on this.
If she has said she doesn't want a physical present from you then I would respect her wishes and donate what you would have spent to charity (or whatever else she said she'd like)
However, that doesn't mean you have to change your way of thinking or doing Christmas. I would still do my own thing, get presents for everyone else in the family/friends, decorate how I like, eat what I like etc.
I don't see it any different as asking a family member what they'd like for Christmas and them saying "would love some pyjamas" or "amazon gift card" and then getting them that.
It's a 2 way street - you can be happy to respect her wishes and donate to charity for her gift but she will also need to respect your wishes that you have your own way of enjoying Christmas.